IAI will be rendered at every visit (treatment at the week 26 mandatory visit will be administered based on the treat and extend status), no earlier than 4 days before the target date and no later than 4 days after the target date. Each extension will be 2 weeks in duration beyond the initial 4-week interval. If the extension criteria are not met on a follow-up visit, the treatment interval will be reduced by 2 weeks. Follow up interval will continue to be reduced by 2 weeks until the extension criteria are met or a 4-week interval is reached.